Parts of a sentence are given below. The first part (A) is in the correct order, while the other parts of the sentence (B, C, D, E) are jumbled up. Arrange the parts in the correct order to form a meaningful and coherent sentence. A. The biologist investigated B. in migratory birds C. seasonal variation D. in behavioral E. patterns

1. BCDE
2. CBDE
3. CDEB
4. BDCE